Gear-cutting apparatus.



PATENTED JULY 7,

J. P. A. MILL. GEAR CUTTING APPARATUS.

APPLICATION FILED JAN. 4, 1907.

4 SHEETS-83233! 3..

ifmesses:

NO. 892,442. 'PATBNTBB JULY '2, 1908,

' J. P. A. MILL.

GEAR CUTTING APPARATUS.

APPLICATION FILED JAN. 4, 1907.

1 SEEETSSHEET 2.

77 B jagpg A'iatnmay 22m 392,442. ATBNTBD JULY 7, 1908 J. P. A. MILL.

GEAR- UUTTING APPARATUS.

APPLICATION FILED JAN. 1, 1907.

4 SHEETS-SHEET 3.

Q l llilll No. 892,442. PATBNTED JULY 7,1908.

v A J.P .,AAILL. GEAR CUTTING, APPARATUS. 4

APPLICATION FILED JAR-1,1907.

4 SHEBTS-SHEET 4.

QWMA

L I Inventor A i Attorney the following is u. specification.

outrun JOHAN FBEDERICH A. MILL, OF

rr irns riiriu t HAlvlILTON, OHIO, ASSIGNGlt OF ONE-HALF TO MAU D ESTELLE;

MILL, 0F HAMILTON, OHIO.

GEAR-CUTTIEJ'G- APPARATUS.

No. scenes.

Application filed. January 4, 1907. Serial No.

This invention pertains to apparatus for cutting bevel gears by the method of focal plsning snd the exemplifying embodiment herein. set forth. ts-kes t 1e form of u portable self-conteined appliance adapted to be socured to the table of any ordinary metal shaping machine, the general system of construction. however, lending itself foruse with most any kind of reciprocating metalparing machine.

The invention will be readily understood from the following description taken in eonnection with the accompanying drawings in ungles j-luco view of the cutting tool in COIljill'lQhlOll Figure 1 is a side elevation of a geer cutting apparatus exemplifying my invention:

Fig. 2 a: front elevation of the same,

i part verticai sect on,

the ipnndrel being omitted:

Fig. 3 e plan, pert horizontal section, these her mandrel and indcnin mechanism bell!" omitted: Fig, 4 a vertical section in the plane of the vertical :LXIS of the apparatus right to the horizontal axis: and Fig. 5 a

. with its setting, gage.

in the drawings :-'l, indicates a base plate adapted to be rigidly secured to the ti ble of e shaping machine: 2, the upper surface of the base plate, cuhirut one end and open at the other end: 3, a housing resting 'on the base-plste2 4, a circular dovetailed boss rigidly formed with the base of the housing and engaging the dovetailed recess in the base-plate: 5, it glb snugly fitting the open end of the dovetailed recess in the base-plate and having its inner end engaging the boss 4: 6, u screw engaging the base-plate and gib and serving to adjust thclotter inwardly so that the housing; becomes clumped with satisfactory firum' .ss to the base-plate while at liberty to rotate upon the axis of the dovetailed parts, which axis constitutes what will be hereinafter referred to as the vertical of the apparatus: 7, upwardly projecting side-arms on the housing, one at each side ofthe vertical axis: the

horizontal bearing ineach of these arms, theircommon axis constituting -what will he r gingfte'rbo referred toas the horizontal Specification of Letters Patent.

i l l from the horizontal axis: 10, the trunnions of u dovetailed recess in i senu-e1rl I l l nuts thereon, the gear blzin l l l Patented. July'7, 1908;

axis of the apparatus, this horizontal axis intersecting the vertical axis, the point of intersection constituting the focus of the system or the apex of thc cones represented by the bevol-geers to be cut: 9, an arbor-bee 'ing having at its lower end a fork trunnioned to the bearings?) so that the arbor-bearing may move angularly upon thehorizontsl axis of the apparatus, the axis of the arbor-bea riiig cut tiing the intersection of the vertical 'end hori zontei axes of the apparatus,or,in,otherwords, cutting the focus of the system, the lower end of the arbor-bearing being at some distance the arbor-bearing: 11, :i bore, of accurately known diameter, axially through the forkarms of the arbor-hearing and through the trunnions: 12, the tapering bore of the arborbearing: 13,the arbor accuratelyfitted for roe l tation therein: 14-, a worm-wheel fast on the 5 upper end of the arbor: 15, it worm journaled l at the upper end of the arbor-bearing and engaging the worrnqvheel, the worm and worn1- l wheel being merely typical of well known ind'exing devices for rotating the arbor: 16; l the mandrel, having its shankfirmly fitted in i the arbor, the lower end of the mundrelprol jecting out of the arbor end pest'tho focus of l the system and being u-dupted'to receive and iit the gear-blank to be operated upon: 17. the usual screw for drawing the mandrel tightly into the arbor: 18, a nut threaded upon the mandrel, between the gear blank and the lower end of the arbor: l9, a nut threaded upon the mandrel below the gear blank: 20, the gear blank snugly fitting the mandrel and tightly clumped between the occupying such longitudinal position upon the mandrel that it will lie below the focus of the system and have the focus coincide with the apex of-the cone of which the gear blank forms a frus tum: 21, u toothed l trunnion of the arbor-bearing, exterior to the l trunnlon bearing, the preferred construction 1 being that the trunnions are formed integral upon the inner faces of the sectors, the sectors and trunnions fork-arms of the arbor-bearing, before referred to, extending the sectors so that a the bore '11,

test bur may.

, av section supported rigidly by one segmental edge reerwerdly sector carried by each bein ri idl r bolted to the lso through be passed through the bores and across the epperntus: of the idem-ms of the housing and presenting its V and upwurdly: 23, s segmental bol t-slot in the sector 22: 24,

paratus, this stud being outer face of worm-gear 28 trniplet and serving a stop hlock bolted against the inner face of the sector 22 and angularly adjustable along the slot: 25, an adjustable stop-screw carried by the arbor-bearing in position to have its inner end abut against the stop-block 24: 126, a horizontal shaft-journaled in the housing and extending across the same'to the rear of the vertical axis and parallel with the horizontal axis of the apparatus: 27, two pinions last on this shalt, one engaging each of the tool hed sectors 21 28, a ()l'll'l gear fast on one end oi this shaft: 29, a worm journaled in the housing and engaging this worm-gear: 30, a hand-wheel having operative connection with this worm: iii, a vertical guideway supported by the housing near the worm-wheel 52%: $32, a rack sliding in this guideway: 33, a stud prl'ijecting rigidly from the rack, its axis being parallel with the horizontal axis of the preferably provided with a plurality of rollers: 34, a toothed sector engaging rack 32 and mounted for angular adjustment on shaft 26, the preherred construction being to provide the with an annular bolt-slot and to bolt the sector thereat: 35, an n )standing bracket mounted for horizontal sliding adjustn'icnt on the base-plate in a direction tangential to'a circle struck from the vertical axis of the apparatus, this bracket,

hereinafter termed the tem let-bracket having a pair of side-arms strat dling the stud 33' but entirely free of the stud: 36, the tem plot, being in the form of a plate remov'ably secured against one of the side arms of the templet bracket and presenting aproperly contoured ed e against the rack-stud 33, Fig. 1 illustrating the templet; as being disposed at thelett ofthe stud: 37, aduations, preferably verniercd, at the Silt ing joint between the teniplet-bracket and the base-plate to facili- Late the accurate adjustment of the tcmplet in a horizontal direction: 38, a lever bearing against the side of the stud 33 opposite the to hold the stud against the contour edge of the t'emplet, this lever being adapted to have attached to it a weight or its equivalent to cause it to exert the printer pressure on the stud which pressure,

by the way, may be very light: 39, gearing connecting the spindle'of hand-wheel with the spindle of worm 29: 40, a ratchet-wheel loose on the spindle of hand-wheel 30 bctween the hub of that hand-wheel and a collnr on thespindle: 41, friction-washers at each side of the ratchetwhecl: 42-, a out on the spindle of hend-wheel 30 serving to clamp the ratchet-wheel between the l'riction-was hers and produce the desired amount oi driving capacity between the ratchet.- wheei and. worm 29: 43, a pawl carrying arni pivoted on the spindle ofhand-wheei 3t): 44, a rod connected. with this arm and adapted to receive reciprocating suitable part of the shaper, say some part of .ivardly irom the up motion 'lrom any? the usual feed mechanism of the shaper: 45', a pawl carried by the pawl carrying arm and engaging the ratchet-wheel: 46, screws for adj ust-ing the templet bracket 35 on the baseplate: 47, an accurately formed rib projectmg up from the base of the housing and extending at right angles to the plane of the horizontal axis of the apparatus: 48, a gagearin free to slide on the base of the housing and nicely fitting the rib 47, the upper end of this arm projecting up into the horizontal plane of the horizontal axis of the apparatus: 49, a gage-plug secured to and projecting inbracket in the vertica and horizontal p anes of the focus, the preferred construction for this gage plug being a cylindrical plug held rotarily in a cylindrical bore in the top of-the gage bracket and projecting outwardly --as well as inwardly from the gage-bracket: 50, the outer end of this gageplug, this end being preferably brought to a point disposed accurately in the vertical, and horizontal plane of the focus, the outer end of theplug being cut away: down to its center: 51, the tool, to be reciprocatcd as usual, and having a cutting corner which is to do the work, this tool to reei rocate in a path at right an les to the vertical axis of the apparatus 8.1K at the level of the horizontal axis: 52, cooperating graduations, preferably vcrniered, at the joint of sliding engagement between the base of the housing and the base. of ga e-arln 48: 53, cooperating graduations, whic are preferably verniered on sector 22 and a contiguous portion of the arbor-bearing.

By means of the mandrel-nuts the gear blank may be adjusted to proper position relative to the focus; by means of the indexing mechanism the ear-blank may be turned .upon its axis for t e indexin adjustment; by means of the hand-wheel 30 the arbor-bearing and thcparts carried byit, maybe adjusted angularly into the general position desired and given proncr angular. motion for feeding purposes as t e tool cuts down the side of the tooth; as successive cuts the templct-stud descends along the ed e the ear-blan to move angularly on the vertica axis of the system; by means of the adjustable sector 34 the templet-stud'can be set into proper relationship with the templet alter the eneral adjustment has been made For the arbor-hearing to suit the bevel of the gcar-blank in hand; by reversing the templct and securingit to the second arm of thetemplet bracket it may engage theother side of the tei'nplet-stiud and provide for operations at the opposite side of the tooth spaces, by bringing the horizontal arm of lever 38 to the vertical it may be caused to act properly on: the templct-stud under the new conditions of the tcmplet, by means of screws +16 the templet in its new position may be shifted sidcwise er end of the agethe tooth feeds upward for the of the teniplet and compels sea/lea to secure the proper width of tooth space; by I longitudinal po-" means of the gage-arm the sition of the 'geawblault upon the mandrel may be accurately determined through the medium of gage-point 49; bymeans of the outer end 50 of the gage-pli1g the cuttingcorncr of the tool may be accurately adjusted to the focal line in which it is to always work; and by means of the rod 44 an automatic feeding motion may b'c'transmit- .ted tov the spindle of hand-wheel 30.

Assume the gear-blank to have been producedof roper size for specified bevel, pitch andnum er of teeth and assume the templet to have its edge-of proper contour and to be secured upon the lefthand arm ofth'e temof the apparatus. 1 gear to be produced,

let-bracket. Forsimplicity sf description at it be assumed that the teeth have been either cast or blocked out so that attention need be given only to the refined capacities The specification for the will involve a certain angle of a line cutting its focus and pitch line. By means of the hand-wheel let the arborbearing and the parts carried by it be adjusted on the horizontal axis of the appara tus till the-specified an le is read at graduations, 53. Let the blan be placed upon the mandrel, at random position between the mandrel'enuts.

By means of the mandrel nuts let the blank be adjusted and secured longitudinally on the mandrel till its outer I itch line is the specified'distance from the orizontal axis of the apparatus, the exactnessao'f this setting being determined by gage-plug 49 as referred to readings taken at 'gradu'ations 52. Let the tool be adjusted to v the surfacevor to the point of gageplug' .50, which will cause its path tocut the focus.

Let. the; gage-armrthen be removed: Let sector 34; assnuned as heretofore free from "worm-wheel 28, be now secured to theworm-- Wheel in such angular position that stud 33 coincides with the; pitch-line point on the templeta Now, the arbor being lockedby the index mechanism against rotation, by

means of hand-wheel 30, ti the-mandrel and its parts downwardly till t c beveled face of the blank is below the cutting plane. The cutting at one side of the tooth-space may now proceed, handswheel 30 being advanced after each cut so as to raise the blankangularly till the face of the tooth is finished.

Whilethis angular raising of the b'lankto the cut. progresses the stud 33 travels down the teiriplt, and the'housi'ngand the parts-carried by it are on the vertical axis of the apparatus thus tooth-side a contourin' corre.

forced into angular movement giving to the spondence ,witathe templet." When the fth -forftlic tooth has v been reached byt sto l-th end of stopscrew 25 will strike against stop'block 24andthc feed? me: can proceed no further. "ll1ese"s 'tops will have beenadjust'ed for appropriate;

specified stopping stopping position. In doing this the stopwill be adjusted for they major range bloc v and the screw for the minor range, and the angle for which the stops are to be adjusted can be accurately taken from the graduations 53.

[is thus far referred to the feeding. is assumed as having been done by hand. The power feed, derived from rod 44, may be employed if desired, nut 42 being tightened to sufiiciently clamp the ratchet between the friction disks, a slipping of this clamping taking place and. the feeding ceasing when the tion existing between thes eciiied apex distance of the blank and at .t ic distance from the vertical axis of the apparatus to the vertical plane of the templet the teinpletbracket 35' is by means of screws 46 to be shifted till the housing is moved angularly a distance corresponding with the specified width of tooth-s ace, the accuracy of this adjustment being etermined froin'graduations 37. The parts arenowiin condition for the finishing of the second of the sides of the tooth-s )ace and the completion of the gear.

It wil have been noted that while the ho us 'ing has an'angular motion that mbtion is impressed. upon it by the stud bearing against .the edge of the temple't under conditions which would cause the stud to assume varying angular relationship to the face of the edge of the templct, with a possible detrimental effect on the accuracy of transfer of contours from the templet to the gear tooth. But the error thus produced is of immaterial character and maybe entirely neglected if the edge of the templet be can or given a slightly convex cross-socthm, a ccnstructioiti dictated by nice working and durability regardless of accuracy of transfer. It will be obvious that with the positive form of templet shown the stud-thrus would be against thelever, and that with a reverse or negative form of templet the thrust would beagainst ,thetemplet. 7

form, for obvious anti-friction reasons, and

n The stud is preferably in roller as the dragging eiiects ofthe templet and lever are opposed to each other, as regardsthc direction of turning of the roller, I provide the stud with two rollers, one for the templet antloneifor the lever, these two members berug in, dissimilar planes.

. The-accuracy of gage plug 49 with referenee to graduations 52 is im ortant and may" be teste by inserting a test er of known diameter in and at the horizontal axis of the apparatus, the mandrel being, of course, absent. With a test bar, say, two inches in diameter, and with gage-plug 49 in contact therewith, the reading of graduations 52 should show that the face of the gage-plu is one inch from the focus, or, in case of iscrepancy, the needed correction will be indicated.

It is to be understood that the particular construction illustrated is a single exemplification only. I have merel described the principle of my invention an have set forth the best form in which I at present contemplate embodying it. Such terms as horizontal, vertical, etc. ,as employed in the claims, are tobe taken in their relative sense only.

I claim:- 5 I 1. Ingear cutting apparatus, the combination of a base, a housing mounted thereon to turn on a vertical axis, an arbor carrier mounted in the housing to turn on a horizontal axis intersecting the vertical axis mentioned, an arbor mounted in the carrier, at templet on the base and a templet follower carried by the housing, and means intermediate the carrier and templet follower serving to move the follower upon the templet in accordance with the movement ofthe carrier the movement of the follower upon the templet causing movementof the housing on its vertical axis.

2. In gear cutting apparatus, the combination of a base, a housing mounted thereon to turn on a vertical axis, an arbor carrier mounted in the housing to turn on a hori zontal axis intersecting the vertical, axis mentioned, an arbor mounted in the carrier, a templet and an adjustable mounting therefor on the base serving to carry the templet in two different positions, corresponding to the two sides of .the gear teeth being cut, atemplet follower carried by the housing, and v a connection intermediate the carrier and templet follower serving to move the follower upon the templet by the movement of the carrier upon its horizontal axis and thereby serving to move the housing on its vertical axis. V

3. In gear cutting apparatus, the con'ibination, substantially as set forth, of a base plate, a housing vertically pivoted thereto, an arbor-bcming horizontally pivoted to the housing, a rotary arbor mounted in the arborbearing, the axes of the arbor and the vertical and horizontal pivotingintersecting at a focus, locking and indexing mechanism for the arbor, feeding means fm"progressively moving thearbor-bearing uponits horizontal axis, a tcmplct rigidly sup )orted by the base-plate in a plane tangential to a=circle struck from the vertical axis of the housing, a vertically movable horizontal stud cooperating with the cus, locking and indexing i-neehanism for the arbor, feeding means for progressively moving the arbor-bearing .upon its horizontal axes, a vertically movable stud connected with the housing, operative connections between said feeding means and stud to move the stud vertically, a templet-brm-ket rigidly supported by the base-plate, and a temlet removably secured. to said bracket with its edge in engagement with one side of said stud and adapted to be secured in reverse position upon said bracket so as to engage the opposite side of said stud.

5. In gear cutting ap ,)ara'tus, the combination, substantially as set forth, of a baseplate, a housing vertically pivoted thereto, an arbor-bearing horizontally pivoted to the housing, a rotary arbor mounted in the arborbearing, the axes of the arbor and t he vert iral and horizontal pivoting intersecting at a focus, locking and indexing mcclnmism for the arbor, feeding means for progressively moving the arbor-bearing upon its horizontal axes, a templct rigidly carried by the baseplate, a vertically movable stud carried by the housing and engaging the templct, operative connections between said feeding means and stud, and a pivoted lever mounted on the housing and bearing against the stud .on the side opposite the templct and adapted to yieldingly hold the stud against the templet'.

6. In gear cutting apparatus, the combination, substantially as set forth. of a baseplate, a housing vertically pivoted thereto,

an arlmr-bearing horizontally pivoted to the housing, a rotary arbor mounted in'the arbor-bearing, the axes of the arbor-and the vertical and horizontal pivoting intersecting at a focus, locking and indexing mechanism for the'arbor, feeding means for progressively moving-the arbor-bearing upon its horizontal axis, a vertically movable stud carried by the housing, operative connectionsbetween said feeding'mcans and stud, a .templet rig-- idly supported bv'the base-plate ant engaging one side of the stud am. adapted for reversalso as to engage the opposite side of the stud, and a, lever pivotcdon the base-plate and adapted to hold the stud against the ,tcmplct and tube adjusted to engage the opposite side ofthe stud when the tcinplclis reversed. a

Ian

an arbor-bearing horizontally pivoted to the plate, a vertically movable stud carried by the hous ng and engaging the temglet, operaplate, a housing vertically housing, 'a rotary arbormounted in the at.-

' gles to said horizontal pivot axis, and'a gag plate, a housing vertically ivoted thereto,

r i $92,442 A v 5 nation, substantially as set forth, of a base- I plate, a housing vertically pivoted thereto,

housing, a rotary arbor mounted in the far-- bor-bearing, the axes of the arbor and the vertieal andhorizontal pivoting intersecting ata locus locking and indexing mechanism for the arbor, feeding means for'progressivel y moving the arbor-bearing upon its horizontal axis, atemplet-rigidly carried by the base tivo co nneetions between said fee ing means and stud, and adjusting devices between said stud and feeding means to permit the position of the stud along the tem let to be adjusted independent of the ang'u or position of the-arbor-l'iearing.

8. In' gear cutting apparatus,- the combination, substantially'as set'l'orth, of abaseivoted- .thereto, an-arbor-bearing horizontal ypivotedto the box-bearing, the-axes ofthe; arbor andFthe vertical and horizontal'pivotmg interseeting at a focus, a'-" age-arm fitted to slide in the;

'- ing the horizonta housing, a rotary arbor mounted in the arbor bearing, the axes of the arbor and the vertical and horizontal pivoting intersecting at a focus, loeking and indexing mechanism for the arbor, feedin means for progressively moving the arbor-bearing upon its horizontal axes through the tooth depth angle, a seg- Tmental bolt-slot in a art rigidly carried by the housing, a stop-b oek adjustable in said slot, and anadjustablesto -sorew carried by .thearbor-bearing andv ar apted to engage said sto'pdrloek.

12.111, ear cutting apparatus, the combination, substantiallyasset forth, of a baseplate, n housing vertically pivoted thereto,

an arbor-bearing horizontally pivoted to the housing, a rotary arbor mounted in the arborbearing, t he axes of the arbor andthevertical and horizontal pivoting inteiseotingfat a foo'us,'*loekin andi dexin mechanism for thearbor, an 'trunnions' carried by the arborbearing and enga ing the housing and formpivot uniting thefa'rborbearlng and housingsaid trunnions having 'an .airialborefor the reception of a test bar.

13.; -In gear cutting: apparatus, the eoinbination, substantiallyyas setiforth, of a basehousing in a fiane oi mbvement at right{-an;- .jplat e,"ag housinglverti'cally'ipivoted thereto,

plug carried by the-gage-arm in thC'lIItGXSCC-r tion of-the planes of the focus.

her-bearing, the axes of the arbor and-the. vertieal and horizontal ivoting intersecting at a focus, aga'ge-arm' ltted to slide in the housing in a plane of movement at rightangles to said horizontal pivot axis, and a-gage carried by the arm having a member. presenting toward the gear-blank in the horizontal lane of the focus, and; a member presenting away from the blank, terminatin in a sharp setting-point in the intersect on o the focal planes. f

I().- In "ear cutting apparatus, the eomb'i nation, substantially as set forthfof a basean arbor-bearinghorizontal y pivoted to the housing. a rotary arbor mounted in the-'ar bur-homing, theaxes of the arbor and the vertical and horizontal pivotingintersecting at a l'oeus, a gage-arm fitted to slide in the housing in a plane of movement at right angles to said horizontal pivot axis, and a gageplug secured in sa d gage a-rm in the-vertical and horizontal 'phrneol' said locus and having a measuring surface upon its inner end and a settin -surfaee upon its outer end.

ll. 22 gefir cutting apparatus, the (zombinaljon, substantially as set forth, of a basepla'ta a housing vertir-nli pivoted tlk etv, an, arbor'bearing horizontal y pivoted bathe 'anarbor-=bearing?hori2ontally pivoted to the housing, a rotary arbor mounted in the arborbearing Lillie-11x83-OftllQQljbOl' and the yerti-Q 9. In geareutting' apparatus the eom'bioal an Qnation, substantiallyas set f'ortl plate, a" housing vertically ivote w an arbor-bearing horizontal y pivoted tothe housing,'al rotaryv arborimountd in the ar I r g formed oii the'seetors and rengagi bearingsinthqhousing and seoured rigidly -to the arbor-bearingland forming its horizontal pivot, 4 4

r [4.- lnrgear cutting apparatus, the combi- -'nation, substantially-'11s forth, ofa base plate, a housing vertieally: pivoted thereto,

anarbor-bearing horizontally pivoted to the" housing, a rotary arbor mounted in the arborbearin the axes of the arbor and the vertioal anr horizontal pivoting intersecting at a focus, looking and indexing mechanism for the arbor a'rib carried bythe housingat rightangle's to said vertical, and horizontal pivoting, feeding means jl'or progressively moving, the arbor-bearing on its horizontal axes, and a gage-arm adapted Rinse-parable onga-genlent with the rib of the housing l5. 'lngear cutting apfmr'atus, the combi nation, substantiall y 'tuisetf rth, ol abuseplate, a" housing vertically pivoted thereto, an arborbearing horizontally pivoted to the housing, a rotary arbor mounted in the arborboaring, the axes of the arbor and the vertical and horizontal pivoting intersecting at a focus, looking and indexing mechanism for thearbor, feeding means-for progressively moving the arbor-bearing upon its horizontal axis, a vertically movable studrarried by the housing and operatively (.OIIIHEUl-(Hl with said feeding means, a templet-brawhet engag- Ill) *" al-gtign substantially at right an ing a horizontal seat on the base-plate, a templet carried by the templet-bracket and engaged'by said stud, and adjusting screws for adplstmg the templet-bracket and templet in a'direction substantially at right angles with said stud.

16. In gJe'ar cutting apparatus, the combia horizontal seat on the base-plate, a templet carried by the templet-bracket and engaged by said stud adjusting screws for adjusting the templet-bracket and teinplet in a direcles withsaid stud, aridaqJaii' oljarms carried by said tem-' 'plet-bracket-and stragging said stud and adapted to receive 'thdtemplet pon either side of the stud. -"':i'-;

17. In ear cutting apparatus, the Eiiffihij; 3o nation, su stantially as set forth, of a base plate a housing vertically pivotedv thereto",-

an ar or-bearing horizontallypivoted to the housing, a rotary arbormounted'in the ar'-, ,bor-bearing the axes of the-arbor and the vertical an horizontal pivoting intersecting" at afocus', locking andmdexing mechanism for the arbor, a shaft, gearing'eonnecting the. shaft with. the arbor-bearingso that'the turnof the shaft moves thea'rbor-bearing an-.

4o g lfiarly, a rack-guide carried by thehousing,

a rack sliding verticallyin therack-guide, a toothed-member mounted on' said shaft and engaging said rack, a stud carried by the rack, and a templet supported by the baseplate and adapted to be engaged by the stud.

18. In ear cutting apparatus, the combination, su stantially as set forth, of a baseplate, ahousing vertically pivoted thereto, an arbor-bearing horizontally pivoted to the housing, a rotary arbor mounted in the arbor-bearing, the-axes of the .arbor and the vertical and horizontal pivoting intersecting at a focus, locking and indexing mechanism for the'arbor, a shaft, gearing connecting the shaft and..-arbor-bearing whereby the turning of the shaft adjusts .the arbor-bearing angularly, a rack guide carried by'the housing,

member engaging said rack and mounted for angular adjustment on said shalt, a stud carried b the rack, and a tem let rigidly supported? by the base-plate an engaged by the stud. a

19.'In gear-cutting apparatus, the combination of a vertically ivoted housing, an arbor-carrier horizontal y pivoted to the hous- -.ing, a gear-sector on the carrier, a pinion in fixed bearings engaging the sector, wormment arranged to move with the pinion and fixed templet, a templet follower, and a slide movably mounted 111 ways on the housing and engaging the toothed segment, and carrying the templet follower.

20. In gear-cutting mechanism, the comertures forming trunnion-bearii'lgs, an arborcarrier havingforked arms the ends of which have round bores and i ainst the housing arms,- gear-sectors haviii projecting hubs forming trunnions resting in said bearings,

ing the hubs to the carrier-arms. "21.='In gear cutting apparatus, the combiintersecting horizontal and vertical ax es,=' a stationary templet aitemplet follower engagmg the tem let and regulating the angular tical axis," and means internie A iate the. arbor and follower serving to move the latter upon the templet in accordan'ce with the move.- ment of the'arbor on its horizontal axis.

oarrying'sa'id arbor so that it may turn on intersecting horizontal and verticah'axes, a stationary templet, a templet follower engaging the tern let'and regulating the angular position of t 1e arbor with respect to its veragainst the templet, and means intermediate the arbor and follower serving to move the latter upon'the templet in accordance with the movement of'the arbor on its horizontal axis. g 3 JOHAN FREDERICH A. MILL.

Witnesses: r

'- 1 M. S. BELDEN,

ELMER R. SHIPLEY.

a rack sliding in the rack-guide, a toothed gearing for driving the pinion, a toothed segbihiition of a housing'having arms with ap-.

position of t e arbor with res ect to its ver- 1 angularly adjustable in relation thereto,- a

the hubs having bores alinedwith the bores t of the carrier arms, and fastehings connectnation ofva blank-carrying arbor, means for carrylng'saldarbor so that it may turn on 22. In gear cutting apparatus, the combination :of a blank-carrying arbor, means for.

tical'axis, means for holding the follower 1 

